If you don't have a digital camera, one of your friends almost certainly does. These cameras usually take very high resolution images. Please reduce this image using your favorite tools to 160x120 before submitting it. If it's a JPEG image and you have it on an owlnet machine, you would type something like this:
djpeg huge_picture.jpg | pnmscale -width 160 -height 120 | cjpeg > small_picture.jpg
or this:
convert -geomtetry 160x120 huge_picture.jpg > small_picture.jpg
Note: this tends to work great for most digital cameras, which take pictures in the same shape as a typical TV screen (a 4:3 aspect ratio). If you've got something else, or if you want to be clever and reuse some old picture of yourself, please crop it to a 4:3 ratio (yes, wider than it is tall -- no vertical shots) before scaling the picture down. You can crop your picture using Photoshop, if you've got it, or something like gimp, which is installed on the Owlnet machines.